#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
using namespace std;
    int& Add(int a, int b)
    {
        int c = a + b;
        return c;
    }
    int main()
    {
        int& ret = Add(1, 2);
        Add(3, 4);
        cout << "Add(1, 2) is :" << ret << endl;
        return 0;
    }